A double-end screw thread rolling device for middle hexagon

Abstract

This invention relates to the field of fastener processing equipment technology, and discloses a thread rolling device for medium hexagonal double-ended screws. The device includes a frame with an loading and unloading position, a thread rolling mechanism, and a drive mechanism. The thread rolling mechanism includes a fixed thread rolling assembly, a movable thread rolling assembly, and a first linear drive component. A thread rolling support plate is fixed on the frame between the fixed and movable thread rolling assemblies, supporting the threaded section of the medium hexagonal double-ended screw. By grouping the fixed and movable thread rolling wheels to create an axial clearance, combined with the "suspended" support of the hexagonal column section by the support plate, the physical interference problem in the thread rolling process of irregularly shaped fasteners is solved, avoiding mold damage and workpiece scrap. The "mechanical delay" linkage scheme of the push column and the movable connecting rod ensures high positioning accuracy and consistency of the thread processing position. The dual-station parallel design improves production efficiency and reduces labor intensity.

Description

Technical Field

[0001] This invention relates to the field of fastener processing equipment technology, and in particular to a hexagonal double-ended screw thread rolling device. Background Technology

[0002] A hexagonal double-ended screw is a special type of fastener with external threads at both ends (usually one end has a long thread section and the other end has a short thread section), while the middle part has a hexagonal prism section with a hexagonal cross-section. There is usually a cylindrical transition section between the hexagonal prism section and the threaded sections at both ends.

[0003] Because the diameter of the hexagonal column segment protruding in the middle of such screws is often larger than the thread root diameter, during conventional thread rolling processes, if ordinary flat or circular die thread rolling machines are used, the thread rolling die is prone to collision and interference with the hexagonal column segment, leading to die damage or workpiece scrap. Currently, for thread rolling of this irregularly shaped fastener, the industry generally uses manual feeding and manual alignment for single-piece processing. This method not only involves high labor intensity and safety hazards for workers, but also suffers from poor thread coaxiality and axial position consistency due to the difficulty in controlling the accuracy of manual alignment, resulting in extremely low production efficiency and severely restricting the expansion of production scale.

[0004] Therefore, there is an urgent need for a special device that can automate, efficiently and precisely perform thread rolling on hexagonal double-ended screws. Summary of the Invention

[0005] The main objective of this invention is to provide a thread rolling device for a hexagonal double-ended screw, which aims to solve the technical problems in the prior art caused by the special structure of the hexagonal double-ended screw, such as thread rolling interference, low efficiency of manual alignment, and difficulty in ensuring accuracy.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A medium hexagonal double-ended screw thread rolling device includes a frame, on which an upper material position and an lower material position are provided, and on which a thread rolling mechanism and a driving mechanism are provided; The thread rolling mechanism includes a fixed thread rolling assembly, a movable thread rolling assembly, and a first linear drive. The fixed thread rolling assembly is fixedly mounted on the frame, and the movable thread rolling assembly is slidably mounted on the frame. The output end of the first linear drive is connected to the movable thread rolling assembly and is used to drive the movable thread rolling assembly to make linear movements toward or away from the fixed thread rolling assembly. A clearance is provided between the fixed thread rolling assembly and the moving thread rolling assembly to allow the hexagonal column section of the central hexagonal double-ended screw to move. The drive mechanism is located on one side of the thread rolling mechanism and is used to drive the fixed thread rolling assembly and the moving thread rolling assembly to rotate. A thread rolling support plate is fixed on the frame between the fixed thread rolling assembly and the moving thread rolling assembly. The thread rolling support plate is used to support the threaded section of the hexagonal double-ended screw and to suspend the hexagonal column section to avoid contact with the thread rolling support plate.

[0007] Preferably, the fixed thread rolling assembly includes a fixed thread rolling frame fixedly mounted on the frame, a fixed thread rolling shaft rotatably mounted on the fixed thread rolling frame, and two fixed thread rolling wheels fixed on the fixed thread rolling shaft; the movable thread rolling assembly includes a movable thread rolling frame slidably mounted on the frame, a movable thread rolling shaft rotatably mounted on the movable thread rolling frame, and two movable thread rolling wheels fixed on the movable thread rolling shaft; the two fixed thread rolling wheels and the two movable thread rolling wheels are correspondingly arranged, and the clearance is formed between the corresponding fixed thread rolling wheel and the movable thread rolling wheel, forming two sets of thread rolling assemblies for simultaneously processing two hexagonal double-ended screws in the working state.

[0008] Preferably, the drive mechanism includes a drive motor, a dual-output shaft reducer, a first coupling, and a second coupling. The drive motor and the dual-output shaft reducer are both fixedly connected to the frame. The output end of the drive motor is connected to the input end of the dual-output shaft reducer. The two output ends of the dual-output shaft reducer are respectively connected to the fixed thread rolling shaft and the moving thread rolling shaft through the first coupling and the second coupling, wherein the second coupling is a telescopic universal coupling.

[0009] Preferably, the frame is provided with a feeding mechanism, which includes a feeding rack, a feeding tray, a second linear drive, a push plate, and a material push rod. The feeding rack is fixedly installed on the frame, the second linear drive and the feeding tray are fixedly installed on the feeding rack, the output end of the second linear drive is fixedly connected to the push plate, and the material push rod is fixed to the push plate. The feeding tray has a V-shaped structure, and the second linear drive is used to drive the push plate and the material push rod to move so as to push the hexagonal double-ended screw on the feeding tray to the thread rolling tray.

[0010] Preferably, the frame is further provided with a limiting mechanism, which includes a horizontal guide rod, a slider, and a limiting component. The horizontal guide rod is fixedly installed on the frame, and two sliders are slidably installed on the horizontal guide rod. Each slider has a flat surface and an inclined surface at its top end, with the inclined surface located at the end of the flat surface away from the loading position. The top end of the slider closer to the unloading position is lower than the top end of the slider closer to the loading position. The limiting component is disposed on the thread rolling support plate.

[0011] Preferably, the limiting assembly includes a mounting plate, a vertical guide sleeve, a vertical limiting rod, a mounting base, a rolling element, a spring, and a fall arrestor. The mounting plate is fixed to the side of the thread rolling support plate away from the feeding position. The vertical guide sleeve is fixed to the mounting plate, and the vertical limiting rod is slidably installed inside the vertical guide sleeve. The top end of the vertical limiting rod is a limiting end, and the lower end is fixed to the mounting base. The rolling element is installed at the lower end of the mounting base and contacts and engages with the plane or the inclined surface. The spring is fitted onto the vertical limiting rod and its two ends are respectively connected to the mounting plate and the mounting base. The fall arrestor is fixedly fitted onto the vertical limiting rod and located above the vertical guide sleeve, for contacting the upper end surface of the vertical guide sleeve to restrict the vertical limiting rod from detaching. When the rolling element moves to the plane under the guidance of the inclined surface, the slider lifts the rolling element so that the limiting end rises to a height flush with the top end of the thread rolling support plate to block the hexagonal column segment.

[0012] Preferably, the limiting mechanism further includes a limiting push rod and a connecting rod. The limiting push rod is fixedly connected to the push plate, and a push column is fixedly attached to the limiting push rod radially. The connecting rod is fixedly connected to the two sliders. One end of the connecting rod has a cavity and an opening communicating with the cavity along the axial direction. The end of the limiting push rod away from the push plate is inserted into the cavity, and the push column slides within the opening. The length of the opening is adapted to the length of the hexagonal double-ended screw.

[0013] Preferably, a feeding tray is fixed on the frame at the feeding position. The feeding tray has a V-shaped structure and its length is less than the length of the long threaded section of the hexagonal double-ended screw. It is used to support and guide the long threaded section of the hexagonal double-ended screw that moves to the feeding position.

[0014] Preferably, the frame is further provided with a collection trough, which is located on the side of the unloading tray away from the loading position, and the bottom of the collection trough is provided with an inclined discharge channel that runs through the frame.

[0015] Preferably, the feeding tray, the thread rolling tray, and the unloading tray are all provided with a guide chamfer at one end facing the feeding position to guide the hexagonal double-ended screw through.

[0016] Compared with existing technologies, this technical solution has at least one of the following beneficial effects: 1. The structural avoidance design solves the interference problem: the axial clearance is formed by the grouping layout of the fixed and moving thread rolling wheels, combined with the "suspended" support of the hexagonal column section by the support plate, which fundamentally solves the physical interference problem in the thread rolling process of irregular fasteners, and avoids mold damage and workpiece scrap. 2. High-precision mechanical linkage positioning: The "mechanical delay" linkage scheme of the push column and the movable port connecting rod is adopted, which can achieve precise axial alignment without relying on complex electronic sensors. The high repeatability ensures the consistency of the thread processing position and improves product quality. 3. Significantly improved processing efficiency: The dual-station parallel design, combined with the automated loading and unloading mechanism, realizes the leap from single-piece manual operation to dual-piece fully automated assembly line operation, which improves production efficiency and reduces labor intensity; 4. Stable and reliable operation: The anti-fall plate prevents the limit components from falling off, and the chamfered guides at each level prevent material jamming, which greatly reduces the failure rate of the equipment and makes it suitable for high-intensity industrial production environments. Attached Figure Description

[0017] Figure 1 The three-dimensional representation of the hexagonal double-ended screw thread rolling device in this invention. Figure 1 ; Figure 2 The three-dimensional representation of the hexagonal double-ended screw thread rolling device in this invention. Figure 2 ; Figure 3 The three-dimensional representation of the hexagonal double-ended screw thread rolling device in this invention. Figure 3 ; Figure 4 This is a left view of the hexagonal double-ended screw thread rolling device of the present invention; Figure 5 This is a top view of the hexagonal double-ended screw thread rolling device of the present invention; Figure 6 for Figure 5 Sectional view along line AA; Figure 7 for Figure 1 A magnified view of a section at point B in the middle; Figure 8 for Figure 6 A magnified view of a section at point C. In the diagram: 1. Frame; 2. Loading position; 3. Unloading position; 4. Thread rolling mechanism; 41. Fixed thread rolling assembly; 411. Fixed thread rolling frame; 412. Fixed thread rolling shaft; 413. Fixed thread rolling wheel; 42. Moving thread rolling assembly; 421. Moving thread rolling frame; 422. Moving thread rolling shaft; 423. Moving thread rolling wheel; 43. First linear drive component; 44. Clearance clearance; 5. Drive mechanism; 51. Drive motor; 52. Double output shaft reducer; 53. First coupling; 54. Second coupling; 6. Thread rolling support plate; 7. Loading mechanism; 71. Loading frame; 72. Loading support plate; 73. Second linear drive component; 74. Push plate; 75. Material push rod; 8. Limiting device. Mechanism; 81. Horizontal guide rod; 82. Slider; 821. Plane; 822. Inclined surface; 83. Limiting assembly; 831. Mounting plate; 832. Vertical guide sleeve; 833. Vertical limiting rod; 8331. Limiting end; 834. Mounting seat; 835. Rolling element; 836. Spring; 837. Anti-fall plate; 84. Limiting push rod; 841. Push column; 85. Connecting rod; 851. Cavity; 852. Movable port; 9. Discharge tray; 10. Collection trough; 101. Inclined discharge channel; 11. Guide chamfer; 100. Medium hexagonal double-ended screw; 101a. Long thread section; 101b. Short thread section; 101c. Hexagonal column section. Detailed Implementation

[0018] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0019] like Figures 1 to 8 As shown, the hexagonal double-ended screw rolling device provided by the present invention mainly includes a frame 1, a rolling mechanism 4, a drive mechanism 5, a feeding mechanism 7, a limiting mechanism 8, and a material collection system.

[0020] The frame 1 serves as the basic load-bearing structure of the entire device, and it is equipped with a loading position 2 and a unloading position 3, corresponding to the preparation position before processing and the collection position after processing, respectively. The frame 1 is welded from high-strength steel, which has good rigidity and stability.

[0021] The thread rolling mechanism 4 is the core component for thread processing, comprising a fixed thread rolling assembly 41, a moving thread rolling assembly 42, and a first linear drive component 43. The fixed thread rolling assembly 41 is fixedly mounted on the frame 1 and includes a fixed thread rolling frame 411, a fixed thread rolling shaft 412, and two fixed thread rolling wheels 413. The fixed thread rolling frame 411 is welded to the frame 1, the fixed thread rolling shaft 412 is rotatably mounted on the fixed thread rolling frame 411 via precision bearings, and the two fixed thread rolling wheels 413 are fixed to the fixed thread rolling shaft 412 via key connections, maintaining a certain axial distance.

[0022] The movable thread rolling assembly 42 is slidably mounted on the frame 1, and includes a movable thread rolling frame 421, a movable thread rolling shaft 422, and two movable thread rolling wheels 423. The bottom of the movable thread rolling frame 421 is provided with a sliding block or slide rail structure, which cooperates with the guide rail on the frame 1 to achieve precise linear guidance. The movable thread rolling shaft 422 is mounted on the movable thread rolling frame 421 via bearings, and the two movable thread rolling wheels 423 are fixed on the movable thread rolling shaft 422, corresponding one-to-one with the fixed thread rolling wheels 413.

[0023] The first linear drive component 43 is preferably a hydraulic cylinder, fixedly mounted on the frame 1, with its piston rod output end connected to the movable thread rolling frame 421. Through pressure control of the hydraulic system, the movable thread rolling assembly 42 is driven to move linearly closer to or further away from the fixed thread rolling assembly 41, realizing the closing and opening of the thread rolling wheel. When closed, it is in the processing state; when open, it is in the loading / unloading state. The aforementioned thread rolling wheel refers to the designated thread rolling wheel 413 and the movable thread rolling wheel 423.

[0024] A clearance 44 is provided between the fixed thread rolling assembly 41 and the movable thread rolling assembly 42. This clearance is formed in the axial space between the corresponding fixed thread rolling wheel 413 and the movable thread rolling wheel 423. The width of the clearance 44 is slightly larger than the axial length of the hexagonal column segment 101c of the hexagonal headstock 100, ensuring that the hexagonal column segment 101c can pass freely without contacting the thread rolling wheel during the thread rolling process. The two sets of fixed thread rolling wheels 413 and the corresponding movable thread rolling wheels 423 constitute two sets of thread rolling assemblies, which can process two hexagonal headstock 100s simultaneously, realizing dual-station parallel operation.

[0025] The drive mechanism 5 is located on one side of the thread rolling mechanism 4 and includes a drive motor 51, a dual-output shaft reducer 52, a first coupling 53, and a second coupling 54. Both the drive motor 51 and the dual-output shaft reducer 52 are fixedly connected to the frame 1. The output end of the drive motor 51 is connected to the input end of the dual-output shaft reducer 52 via a belt drive assembly. The two output ends of the dual-output shaft reducer 52 are respectively connected to the fixed thread rolling shaft 412 and the moving thread rolling shaft 422 via the first coupling 53 and the second coupling 54. The second coupling 54 is a telescopic universal coupling to accommodate the displacement changes of the moving thread rolling shaft 422 during processing, while ensuring reliable torque transmission and synchronous rotation of the two shafts.

[0026] A thread rolling support plate 6 is fixed on the frame 1 between the fixed thread rolling assembly 41 and the moving thread rolling assembly 42. The thread rolling support plate 6 is used to support the threaded section of the hexagonal double-ended screw 100, namely the long threaded section 101a or the short threaded section 101b, or the cylindrical transition section near it. The height of its top surface has been precisely calculated and adjusted so that the hexagonal cylindrical section 101c is suspended in space, avoiding contact with the thread rolling support plate 6, thereby preventing rotational interference.

[0027] like Figure 1 As shown, the feeding mechanism 7 is located at the feeding position 2 of the frame 1, and includes a feeding rack 71, a feeding tray 72, a second linear drive 73, a push plate 74, and a material push rod 75. The feeding rack 71 is fixedly installed on the frame 1, and the second linear drive 73 and the feeding tray 72 are fixedly installed on the feeding rack 71. The output end of the second linear drive 73 is fixedly connected to the push plate 74, and the material push rod 75 is fixed to the push plate 74. The end of the material push rod 75 is a push head with a certain degree of elasticity, which can be made of rubber to avoid problems such as easy damage to screws due to rigid pushing, as well as problems such as asynchronous pushing and incomplete positioning caused by tolerance. The second linear drive 73 is preferably a cylinder or an electric push rod.

[0028] The feeding tray 72 has a V-shaped structure. Utilizing the self-centering property of the V-groove, the hexagonal double-ended screw 100 is naturally centered under gravity and maintains a horizontal axis. The second linear drive 73 drives the push plate 74 and the material push rod 75 to move axially, pushing the hexagonal double-ended screw 100 on the feeding tray 72 onto the thread rolling tray 6.

[0029] At the thread rolling station, two thread rolling support plates 6 are positioned between two sets of thread rolling wheels. After the hexagonal double-ended screw 100 is pushed into place, its long thread section 101a and short thread section 101b, or their nearby cylindrical portions, directly contact and are supported on the thread rolling support plate 6, while the middle hexagonal column section 101c is directly opposite the clearance gap 44 between the two sets of thread rolling wheels and the gap between the thread rolling support plates 6, remaining suspended. This support method ensures the stability of the hexagonal double-ended screw 100 during the thread rolling process and completely avoids contact interference between the hexagonal column section 101c and any fixed components.

[0030] The limit mechanism 8 is a key component for achieving automated and precise alignment, such as Figure 6 and Figure 8 As shown, it includes a horizontal guide rod 81, a slider 82, a limiting assembly 83, a limiting push rod 84, and a connecting rod 85.

[0031] A horizontal guide rod 81 is fixedly installed on the frame 1, parallel to the material feeding direction. Two sliders 82 are slidably mounted on the horizontal guide rod 81. Each slider 82 has a flat surface 821 and an inclined surface 822 at its top. The inclined surface 822 is located at the end of the flat surface 821 away from the loading position 2, and the top height of the slider 82 closer to the unloading position 3 is lower than the top height of the slider 82 closer to the loading position 2, forming a stepped layout.

[0032] The limiting assembly 83 is disposed on the thread rolling support plate 6 and includes a mounting plate 831, a vertical guide sleeve 832, a vertical limiting rod 833, a mounting base 834, a rolling element 835, a spring 836, and a fall arrestor 837. The mounting plate 831 is fixed on the side of the thread rolling support plate 6 away from the loading position 2, and the vertical guide sleeve 832 is fixed to the mounting plate 831. The vertical limiting rod 833 is slidably installed in the vertical guide sleeve 832 and can move up and down in the vertical direction. The top end of the vertical limiting rod 833 is the limiting end 8331, which is used to directly block the hexagonal column section 101c; the lower end is fixed to the mounting base 834, and the rolling element 835 is installed on the lower end of the mounting base 834, contacting and cooperating with the plane 821 or inclined surface 822 of the slider 82. The rolling element 835 is preferably a universal ball, but it can also be a roller.

[0033] Spring 836 is fitted onto the vertical limiting rod 833, with its two ends connected to mounting plate 831 and mounting base 834 respectively, providing elastic force to reset the vertical limiting rod 833 downwards. Anti-fall plate 837 is fixedly fitted onto the vertical limiting rod 833 and located above the vertical guide sleeve 832, contacting the upper surface of the vertical guide sleeve 832 to limit the maximum upward travel of the vertical limiting rod 833, preventing the limiting rod from falling off due to spring 836 failure or inertial impact.

[0034] The limiting push rod 84 is fixedly connected to the push plate 74 and moves synchronously with the push plate 74. A push column 841 is fixed radially to the limiting push rod 84. The connecting rod 85 is fixedly connected to two sliders 82, enabling the two sliders to move together. One end of the connecting rod 85 has a cavity 851, and a movable opening 852 communicating with the cavity 851 is opened along the axial direction. The end of the limiting push rod 84 away from the push plate 74 is inserted into the cavity 851, and the push column 841 slides within the movable opening 852. The length of the movable opening 852 is matched with the length of the hexagonal double-ended screw 100, forming a "mechanical delay" mechanism.

[0035] The working principle is as follows: In the initial state, the vertical limiting rod 833 is in a low position under the action of the spring 836, maintaining a retracted state, and the rolling element 835 is located at the starting end of the inclined surface 822 of the slider 82. When the second linear drive 73 starts pushing the material, the push column 841 slides freely within the movable opening 852. At this time, the connecting rod 85 and the slider 82 remain stationary, and the first hexagonal double-ended screw 100 can smoothly pass through the limiting position. When the push column 841 touches the end of the movable opening 852, it begins to push the connecting rod 85, and the slider 82 moves accordingly. The rolling element 835 rises along the inclined surface 822. When it moves to the plane 821, the vertical limiting rod 833 is lifted to the highest position, and the limiting end 8331 rises to a height level with the top of the thread rolling support plate 6, which precisely blocks the hexagonal column segment 101c of the corresponding hexagonal double-ended screw 100, achieving precise axial positioning. This "push-then-limit" timing logic ensures that the 100 hexagonal double-ended screw can smoothly enter the workstation and be accurately positioned.

[0036] like Figure 1 As shown, a feeding tray 9 is fixed on the frame 1 at the feeding position 3. The feeding tray 9 has a V-shaped structure, and its length is less than the length of the long thread section 101a of the hexagonal double-ended screw 100. This design allows the feeding tray 9 to only support the long thread section 101a, while the short thread section 101b is suspended, ensuring that the hexagonal double-ended screw 100 maintains a stable posture under gravity and slides out smoothly.

[0037] During the relocation process after processing, when the hexagonal double-ended screw 100 moves away from the loading position 2, the hexagonal double-ended screw 100 near the unloading position 3 has very few points of force contact because only the short thread section 101b of the screw is in contact with the thread rolling support plate 6. Without external support, the long thread section 101a of the hexagonal double-ended screw 100 will tilt downward due to the gravitational torque, thus deviating from its original horizontal running trajectory and causing it to fall off. The unloading support plate 9, by supporting the long thread section 101a of the hexagonal double-ended screw 100, forms a "multi-point linkage support" with the original thread rolling support plate 6. It provides crucial support for the hexagonal double-ended screw 100 that has moved to the very end, enabling the hexagonal double-ended screw 100 to maintain a horizontal posture and slide stably after being released from the clamping of the thread rolling wheel.

[0038] The frame 1 is also equipped with a collection trough 10, located on the side of the unloading tray 9 away from the loading position 2. The bottom of the collection trough 10 is provided with an inclined discharge channel 101 that runs through the frame 1. The finished hexagonal double-ended screws 100 are automatically discharged along the inclined discharge channel 101 to realize continuous production.

[0039] To prevent material from jamming due to minor deviations during conveying, the feeding pallet 72, the threaded pallet 6, and the unloading pallet 9 are all equipped with guide chamfers 11 at the ends facing the feeding position 2. The guide chamfers 11 adopt a rounded or beveled transition design, which can correct the positional deviation of the hexagonal double-ended screw 100 during conveying, prevent the hexagonal column section 101c or the threaded end from snagging on the edge of the pallet, and ensure smooth material flow.

[0040] Work process overview: Material loading stage: Manually or automatically place two medium hexagonal double-ended screws 100 into the V-groove of the material loading tray 72; Material pushing stage: The second linear drive component 73 moves, driving the material push rod 75 to push the hexagonal double-ended screw 100 towards the thread rolling station. At the same time, the limit push rod 84 triggers the slider 82 to move in the later stage of material pushing through the cooperation of the push column 841 and the movable port 852. Positioning stage: The inclined surface 822 of the slider 82 lifts the vertical limit rod 833, and the limit end 8331 raises the blocking hexagonal double-headed screw 100 to achieve precise axial positioning; Thread rolling stage: The first linear drive 43 drives the moving thread rolling assembly 42 to approach the fixed thread rolling assembly 41, the thread rolling wheel closes and clamps the thread section, the drive mechanism 5 starts, the two sets of thread rolling wheels rotate synchronously, and the threads are formed on the surface of the hexagonal double-ended screw 100. Reset phase: After the thread rolling is completed, the moving thread rolling assembly 42 retracts, and the vertical limit rod 833 resets and descends under the action of the spring 836; Material feeding stage: The subsequent material or the pushing mechanism pushes the finished hexagonal double-ended screw 100 to the feeding tray 9. The feeding tray 9 plays a relay guiding role. After the hexagonal double-ended screw 100 completes its final axial displacement on the feeding tray 9, it is smoothly flipped and falls into the collection tank 10 under the force of gravity and the pushing force of the subsequent material, and is automatically discharged through the inclined discharge channel 101.

[0041] This invention achieves efficient, high-precision, and automated thread rolling of 100mm hexagonal double-ended screws through ingenious structural avoidance design, precise mechanical linkage positioning, and a complete fully automatic loading and unloading system. It solves a long-standing technical problem in the industry and has significant practical value and prospects for promotion.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A thread rolling device for a hexagonal double-ended screw, characterized in that, Includes a frame, on which a loading position and a unloading position are provided, and on which a thread rolling mechanism and a driving mechanism are provided; The thread rolling mechanism includes a fixed thread rolling assembly, a movable thread rolling assembly, and a first linear drive. The fixed thread rolling assembly is fixedly mounted on the frame, and the movable thread rolling assembly is slidably mounted on the frame. The output end of the first linear drive is connected to the movable thread rolling assembly and is used to drive the movable thread rolling assembly to make linear movements toward or away from the fixed thread rolling assembly. A clearance is provided between the fixed thread rolling assembly and the moving thread rolling assembly to allow the hexagonal column section of the central hexagonal double-ended screw to move. The drive mechanism is located on one side of the thread rolling mechanism and is used to drive the fixed thread rolling assembly and the moving thread rolling assembly to rotate. A thread rolling support plate is fixed on the frame between the fixed thread rolling assembly and the moving thread rolling assembly. The thread rolling support plate is used to support the threaded section of the hexagonal double-ended screw and to suspend the hexagonal column section to avoid contact with the thread rolling support plate.

2. The hexagonal double-ended screw thread rolling device according to claim 1, characterized in that, The fixed thread rolling assembly includes a fixed thread rolling frame fixedly mounted on the frame, a fixed thread rolling shaft rotatably mounted on the fixed thread rolling frame, and two fixed thread rolling wheels fixed on the fixed thread rolling shaft; the movable thread rolling assembly includes a movable thread rolling frame slidably mounted on the frame, a movable thread rolling shaft rotatably mounted on the movable thread rolling frame, and two movable thread rolling wheels fixed on the movable thread rolling shaft; the two fixed thread rolling wheels and the two movable thread rolling wheels are correspondingly arranged, and the clearance is formed between the corresponding fixed thread rolling wheel and the movable thread rolling wheel, forming two sets of thread rolling assemblies for simultaneously processing two hexagonal double-ended screws in the working state.

3. The hexagonal double-ended screw thread rolling device according to claim 2, characterized in that, The drive mechanism includes a drive motor, a dual-output shaft reducer, a first coupling, and a second coupling. The drive motor and the dual-output shaft reducer are both fixedly connected to the frame. The output end of the drive motor is connected to the input end of the dual-output shaft reducer. The two output ends of the dual-output shaft reducer are respectively connected to the fixed thread rolling shaft and the moving thread rolling shaft through the first coupling and the second coupling, wherein the second coupling is a telescopic universal coupling.

4. The hexagonal double-ended screw thread rolling device according to claim 1, characterized in that, The frame is equipped with a feeding mechanism, which includes a feeding rack, a feeding tray, a second linear drive, a push plate, and a material push rod. The feeding rack is fixedly installed on the frame, and the second linear drive and the feeding tray are fixedly installed on the feeding rack. The output end of the second linear drive is fixedly connected to the push plate, and the material push rod is fixed to the push plate. The feeding tray has a V-shaped structure, and the second linear drive is used to drive the push plate and the material push rod to move, so as to push the hexagonal double-ended screw on the feeding tray to the thread rolling tray.

5. The hexagonal double-ended screw thread rolling device according to claim 4, characterized in that, The frame is also provided with a limiting mechanism, which includes a horizontal guide rod, a slider, and a limiting component. The horizontal guide rod is fixedly installed on the frame, and two sliders are slidably installed on the horizontal guide rod. Each slider has a flat surface and an inclined surface at its top. The inclined surface is located at the end of the flat surface away from the loading position, and the top height of the slider closer to the unloading position is lower than the top height of the slider closer to the loading position. The limiting component is disposed on the thread rolling support plate.

6. The hexagonal double-ended screw thread rolling device according to claim 5, characterized in that, The limiting assembly includes a mounting plate, a vertical guide sleeve, a vertical limiting rod, a mounting base, a rolling element, a spring, and a fall arrestor. The mounting plate is fixed to the side of the thread rolling support plate away from the feeding position. The vertical guide sleeve is fixed to the mounting plate, and the vertical limiting rod is slidably installed inside the vertical guide sleeve. The top end of the vertical limiting rod is a limiting end, and the lower end is fixed to the mounting base. The rolling element is installed at the lower end of the mounting base and contacts and engages with the plane or the inclined surface. The spring is fitted onto the vertical limiting rod, and its two ends are respectively connected to the mounting plate and the mounting base. The fall arrestor is fixedly fitted onto the vertical limiting rod and located above the vertical guide sleeve, for contacting the upper end surface of the vertical guide sleeve to limit the vertical limiting rod from detaching. When the rolling element moves to the plane under the guidance of the inclined surface, the slider lifts the rolling element, causing the limiting end to rise to a height flush with the top end of the thread rolling support plate, thereby blocking the hexagonal column segment.

7. The hexagonal double-ended screw thread rolling device according to claim 6, characterized in that, The limiting mechanism further includes a limiting push rod and a connecting rod. The limiting push rod is fixedly connected to the push plate, and a push column is fixed to the limiting push rod radially. The connecting rod is fixedly connected to the two sliders. One end of the connecting rod is provided with a cavity, and a movable opening communicating with the cavity is opened along the axial direction. The end of the limiting push rod away from the push plate is inserted into the cavity, and the push column slides in the movable opening. The length of the movable opening is adapted to the length of the hexagonal double-ended screw.

8. The hexagonal double-ended screw thread rolling device according to claim 1, characterized in that, A feeding tray is fixed on the frame at the feeding position. The feeding tray has a V-shaped structure and its length is less than the length of the long threaded section of the hexagonal double-ended screw. It is used to support and guide the long threaded section of the hexagonal double-ended screw that moves to the feeding position.

9. The thread rolling device for a hexagonal double-ended screw according to claim 8, characterized in that, The frame is also provided with a collection trough, which is located on the side of the unloading tray away from the loading position. The bottom of the collection trough is provided with an inclined discharge channel that runs through the frame.

10. The hexagonal double-ended screw thread rolling device according to claim 8, characterized in that, The feeding tray, the thread rolling tray, and the unloading tray all have guide chamfers at one end facing the feeding position to guide the hexagonal double-ended screws through.

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